The Need for Changing the GPS Satellite Constellation to Satisfy Various User Requirements

Wael Zakout and David F. Mezera

Abstract:	Since the launch of the first GPS satellites, numerous new techniques and methods have been developed to utilize the system and hundreds of applications have been added to those originally considered. GPS user requirements, for applications such as navigation, geodetic surveying, time transfer, photogrammetry, etc., vary in both accuracy and reliability. These requirements are a function of location, e.g., the use of GPS for land navigation in a large city requires more (potentially) visible satellites than does ocean navigation. A survey of various GPS applications and corresponding requirements are discussed in details. Then methods are discussed for translating these requirements into the minimum number of visible satellites and the corresponding DOP factors needed. Finally, a new approach for mapping these requirements into separate Geographic Information System spatial data layers is addressed.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	99 - 107
Cite this article:	Zakout, Wael, Mezera, David F., "The Need for Changing the GPS Satellite Constellation to Satisfy Various User Requirements," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 99-107.
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